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Proceedings Paper

Optically active quantum dots
Author(s): Valerie Gerard; Joseph Govan; Alexander Loudon; Alexander V. Baranov; Anatoly V. Fedorov; Yurii K. Gun'ko
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Paper Abstract

The main goal of our research is to develop new types of technologically important optically active quantum dot (QD) based materials, study their properties and explore their biological applications. For the first time chiral II-VI QDs have been prepared by us using microwave induced heating with the racemic (Rac), D- and L-enantiomeric forms of penicillamine as stabilisers. Circular dichroism (CD) studies of these QDs have shown that D- and L-penicillamine stabilised particles produced mirror image CD spectra, while the particles prepared with a Rac mixture showed only a weak signal. It was also demonstrated that these QDs show very broad emission bands between 400 and 700 nm due to defects or trap states on the surfaces of the nanocrystals. These QDs have demonstrated highly specific chiral recognition of various biological species including aminoacids. The utilisation of chiral stabilisers also allowed the preparation of new water soluble white emitting CdS nano-tetrapods, which demonstrated circular dichroism in the band-edge region of the spectrum. Biological testing of chiral CdS nanotetrapods displayed a chiral bias for an uptake of the D- penicillamine stabilised nano-tetrapods by cancer cells. It is expected that this research will open new horizons in the chemistry of chiral nanomaterials and their application in nanobiotechnology, medicine and optical chemo- and bio-sensing.

Paper Details

Date Published: 9 October 2015
PDF: 12 pages
Proc. SPIE 9545, Nanophotonic Materials XII, 95450N (9 October 2015); doi: 10.1117/12.2187198
Show Author Affiliations
Valerie Gerard, Trinity College Dublin (Ireland)
Joseph Govan, Trinity College Dublin (Ireland)
Alexander Loudon, Trinity College Dublin (Ireland)
Alexander V. Baranov, ITMO Univ. (Russian Federation)
Anatoly V. Fedorov, ITMO Univ. (Russian Federation)
Yurii K. Gun'ko, Trinity College Dublin (Ireland)
ITMO Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 9545:
Nanophotonic Materials XII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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